code: def __call__(self, x: TensorType) -> tf.Tensor:
      return self.a(x)
  
imports: import copy
  import pickle
  from typing import Any, Type
  import pytest
  import tensorflow
  import tensorflow_probability
  from check_shapes import check_shapes
  from packaging.version import Version
  import gpflow
  from gpflow.base import TensorType
label_desc: Use image node_id 2 for calling the B obj's underlying member method code with example usage: obj.__call__(x) and returns: self